#include
#define uchar unsigned char
#define uint unsigned int
#define DELAY 1000
void delay(uint z) //1ms
{
uint x,y;
for(x=z;x>0;x--)
for(y=111;y>0;y--);
}
void main()
{
uchar i,dt;
EA=1; //Enable total interrupt
EX1=1; //Enable external interrupt 1
//IT1=0; //Set external interrupt 1 as low level trigger
IT1=1; //Set external interrupt 1 as falling edge trigger
while(1)
{
dt=0x01;
for(i=0;i<8;i++)
{
P2=dt;
delay(DELAY);
dt<<=1;
}
}
}
void exter1() interrupt 2
{
P2=0xff;
}
If no interruption occurs, a single lamp will light up in a cycle; if an interruption occurs, all lights will light up.
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